Gce Model Questions Vol1 2024 Biology Question 12
Practice objective / multiple choice question 12 from the 2024 Gce Model Questions Vol1 Biology examination.
Two plant species A and B compete in a meadow. Their dynamics are described by\n\[\frac{dN_A}{dt}= r_A N_A\Bigl(1-\frac{N_A+\alpha N_B}{K_A}\Bigr),\qquad\frac{dN_B}{dt}= r_B N_B\Bigl(1-\frac{N_B+\beta N_A}{K_B}\Bigr).\]\nGiven \(r_A = 0.4\ \text{month}^{-1},\ K_A = 5000,\ r_B = 0.3\ \text{month}^{-1},\ K_B = 4000,\ \alpha = 0.5,\ \beta = 0.8\). A herbivore reduces the intrinsic growth rate of species A by 20 % (so the effective \(r_A\) becomes 0.32). Assuming the system reaches equilibrium (\(dN_A/dt = dN_B/dt = 0\)), what are the equilibrium population sizes \(N_A^*\) and \(N_B^*\) (in individuals)?
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This is Gce Model Questions Vol1 2024 Biology Question 12. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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